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Severn barrage: Row breaks out over UK's biggest renewables project

Government consultants have been accused of miscalculating the costs of a project to generate vast amounts of green electricity in the Severn estuary, promoting a 10 mile-long tidal barrier strongly backed by ministers in preference to a tidal lagoon scheme by Tidal Electric that engineers and environmentalists say is far less damaging. Finding a way to harness the power of the Severn's tides is important as it would represent a big step towards Britain's target of generating 35% of all electricity from renewable sources by 2020.

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